Mechanical Seal Style RB1

Single Rotating Welded Metal Bellows Cartridge with Circulation Gland

Mechanical Seal Style RB1


  • Part of Flex-A-Seal’s integrated/platform single cartridge seal design
  • Patented (Patent Number US 7,979,986) Plunger-Lock drive
  • Only two static O-rings – cost savings are substantial when perfluorelastomers are required
  • Rotating welded metal bellows are self-cleaning during operation
  • Simple cartridge seal installation – slide seal onto the shaft, bolt to box face, tighten set screws, and remove spacers
  • Hydraulically balanced design
  • No moving elastomers. No fretting – No hang-up
  • Minimal number of parts. Simple design means fewer pieces to cause problems
  • Metric sizes readily available
  • Sleeve is isolated from product
  • Quick inexpensive repairs

RB3 with Circulation, Vent & Drain Gland

  • All the benefits of the RB1 design plus vent and drain gland with throttle bushing
  • Pipe connections are made to different sizes to assure that correct piping plans are employed
  • Cost-effective upgrade


Operating Conditions

Max Temp:400°F (204°C)
Max Pressure:300 PSI (20 bar)
Max Speed:4500 FPM (22 m/sec)

Note: Max Temperature / pressure / speed indicate operating extremes independently and do not imply the seal will function at these extremes at the same time. Contact Flex-A-Seal if in doubt.



Depending on your specific needs and application, Flex-A-Seal can help you identify the ideal products. Contact us to tell us about your needs and request a quote.